Conda Install Package Error[通俗易懂]

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CondaHTTPError: HTTP 000 CONNECTION FAILED for url

问题：conda无法安装更新，报错内容如下：

conda create -n tensorflow python=3.5

Fetching package metadata .......
CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://nanomirrors.tuna.tsinghua.edu.cn/anaconda/cloud/linux-64/rpodata.json>
Elapsed: -

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.
ConnectTimeout(MaxRetryError("HTTPSConnectionPool(host='nanomirrors.tuna.tsinghua.edu.cn', port=443): Max retries exceded with url: /anaconda/cloud/linux-64/repodata.json (Caused by ConnectTimeoutError(<requests.packages.urllib3.connecton.VerifiedHTTPSConnection object at 0x7fb6d340dcc0>, 'Connection to nanomirrors.tuna.tsinghua.edu.cn timed out. (connct timeout=9.15)'))",),)

解决方法：

#首先先添加清华的镜像源
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --set show_channel_urls yes

#如果无法解决，则删除channels配置文件中部分内容

#具体操作如下:
#1、快速创建channels配置文件的备份(保险起见)
cp ~/.condarc{ 
   ,.bak}

#查看配置文件的内容
cat ~/.condarc.bak 
channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/
  - https://nanomirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  - defaults
  - https://nanomirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda
  - https://nanomirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda/conda
  - bioconda
  - r
  - conda-forge
show_channel_urls: true

#2、删除部分内容
## 主要是删除此行： - defaults
#修改后配置文件的内容如下：
vim ~/.condarc
channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/
show_channel_urls: true

ProxyError: Conda cannot proceed due to an error in your proxy configuration

执行代码：conda install -c conda-forge r-seurat=4.0.4

当使用 conda install 安装软件时出现如下报错：

ProxyError: Conda cannot proceed due to an error in your proxy configuration.
Check for typos and other configuration errors in any '.netrc' file in your home directory,
any environment variables ending in '_PROXY', and any other system-wide proxy
configuration settings.

解决方案

$ echo $http_proxy
http://10.53.15.246:3128
$ echo $https_proxy
http://10.53.15.246:3128

然后修改配置文件 ~/.condarc

修改后配置文件的内容如下：

$ cat ~/.condarc
channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/
  - r
  - conda-forge
show_channel_urls: true
proxy_servers:
  http: http://10.53.15.246:3128
  https: http://10.53.15.246:3128
ssl_verify: false